6 Factors That Secretly Influence Who You Have Sex With

Statistics indicate that more and more frequently, "hookups" are turning into meaningful relationships. While that might sound like a snazzy pickup line, it actually means you might marry someone because of the color of the shirt she was wearing the night you met her. According to science, the world around you is dangerously full of hidden aphrodisiacs that can land you in bed, and even in long-term relationships, with someone who's totally wrong for you.

#6. Fear

The Romantic Notion:

"If two people are meant for one another, it doesn't matter whether they meet in high school or prison -- love will find a way."

Science Says:

"Did you see a comedy or a horror movie on your first date? The answer to that question can determine who you end up sleeping with more than any of the "important" factors you pay attention to."

We tend to think that emotions such as fear and anger cause our hearts to speed up. According to the two-factor theory of emotion, it's the other way around. When you meet a 15-foot-tall grizzly bear in the woods, your body doesn't have time to ask your brain about feelings. Instinct takes over and turns your heart into an internal combustion engine. According to the theory, it's only later that we come up with "an emotional interpretation of that arousal" and decide we were scared.

Here's where it gets weird. If you experience the symptoms of fear around someone with your preferred brand of sexual organ, your brain will assume that your heart was racing because you were sexually attracted to that person. Seriously. Science even found a way to prove it.

He just crapped his pants, and she's still going to walk away with a crush.

In a study by Donald G. Dutton and Arthur P. Aron, two groups of males were approached by an attractive female research assistant and were asked to fill out a survey. One group was approached on a solid, railed-in foot bridge that was five feet off the ground, while the other was crossing a "five-foot wide, 450-foot long bridge" that had "a tendency to tilt, sway and wobble" and featured "a 230-foot drop to rocks and shallow rapids below."

Yeah, science is a dick like that.

The men dangling hundreds of feet above certain death were just as likely to stop for the hot lady asking them to do paperwork. Also, they tended to provide more sexual answers to the open-ended questions on the forms they filled out. What's really weird is that their confused terror boner didn't go away. Both groups were given a number where they could reach the female assistant in case they required any "clarification" on the surveys. The guys on the suspension bridge were five times as likely to call her the next day.

That's why this is bad news for your soul mate and good news for some idiot who happens to take you to a scary movie. The sexual charge we get from being scared while sitting next to someone doesn't just wear off as the credits roll. Fear makes that person more sexually attractive in your memories.

Scientists say women are just as prone to the scare-induced hornies, which probably explains why guys always decided that "Makeout Point" should be within 10 feet of a dangerous cliff. Being on a first date in a scary environment is basically like dosing each other's drinks with an aphrodisiac.

For longer movies, try punching them intermittently during the quiet bits.

But scary movies aren't the only type that can screw with your ability to choose a partner. Ladies, let's say you take your soul mate to the latest Nicholas Sparks movie (you presumably don't know he's your soul mate yet). At a sad moment in the movie, you start crying, and he goes in for the cuddle. That slide whistle you just heard was his testosterone level dropping like a homesick rock. It turns out that female tears produce a hormone that dampens the male libido. According to the scientist behind the discovery, the purpose is evolutionary: "We've uncovered the chemical word for 'no,' or 'not now.' " While that probably came in handy when the dating scene was full of hunter-gatherers, in the modern world, this means that something as simple as a bee sting can scare away the person you're destined to be with for the rest of your life.

#5. The Color Red

The Romantic Notion:

"Looks don't matter. It's what's inside that counts. Once a girl starts talking to you, she'll see the real you and fall in love."

The "real you" would have more Cheetos stains.

Science Says:

Yeah, that's all fine and nice and romantic-sounding, but if you really want to get the girl, make sure you're wearing the right color.

But first, here's one for the ladies: A few years ago, a study found that men tended to be attracted to women who were wearing red. Participants in the study were shown various pictures of women in different colors. The key was that researchers snuck in more than one photo of certain women wearing different tones. You would think that if the men found a woman to be unattractive in one color, she would be unattractive in any color. Nope. It didn't matter whether the picture of a woman they saw in blue was the same person, only digitally changed to be wearing red. The redder picture was almost always rated as sexier. The men were even willing to spend more money on a date with the women in red than with her counterparts wearing blue, green or gray. Apparently, the people who run red-light districts are smarter than we've been giving them credit for.

As with women's boner-slaying tears, science thinks this has to do with evolution. More specifically with this:

Various types of monkeys and apes have, to put it in scientific terms, hilariously bright-red asses. These serve a purpose other than making humans point and laugh. They tend to swell and get redder when a female is fertile, indicating this fact to the males and thus ensuring the continuation of the species. This relationship of red and fertility may play with a man's perception of what woman he finds most attractive. The monkey in him wants to make sure he knocks someone up, so the suave modern man finds himself most attracted to the lady in red.

A more recent study has found that women are just as susceptible to this phenomenon. Using a similar test of looking at photos, the researchers found that a man wearing red is just as irresistible to a woman. Unlike the evolutionary attraction to a woman in red, researchers say this one is more of a social construct. Women tend to see men wearing red as more powerful, possibly because we associate the color with aggression. Our brains take this to the next level and assume that an aggressive man will be more successful and make more money than a timid one. By wearing red, you project an aura of wealth and potential and sexy. Basically, the only difference between human mating rituals and bullfighting is that human mating rituals didn't give Ernest Hemingway a boner.

This can, of course, be taken too far.

#4. Your Ear and Forearm

The Romantic Notion:

"When the right person comes along, you'll just know."

Science Says:

The reason your brain might "just know" could simply be a matter of which side of your body the person was standing on when he asked you out. Of course, it's not all that simple. To really improve his chances, he'd have to do something drastic, like touching your arm.

Don't think of it as a commute. Think of it as dozens of potential soul mates.

The brain is a really complex organ. But after decades of studying it, most psychologists and neurologists feel comfortable making a couple of generalizations -- namely, that the left side of your brain handles verbal information and is tuned in to positive emotions, while the right hemisphere concentrates on nonverbal stimuli and more negative emotions. They also know that information that goes in your left ear is handled by the right side of the brain.

Armed with this information, psychologists in Italy devised a study that tested how the different sides of your brain process information. What they found is that requests are 50 percent more successful when heard from the right side than the left. In the study, a woman approached people at a club and asked for a cigarette, leaning in to one side or another. Exactly double the number of people obliged her when she asked on their right. In a dating situation, not only could the chances of someone saying yes to a date hinge on who is standing where, but the emotional aspect could come into play as well. Sure, you might agree to go out with someone who talked in your left ear, but your first impression might be to associate him with more negative emotions.

Sorry, lady. From now on, he thinks you're kind of a bitch.

You're even more likely to accept a date if the person asking also touches you on the arm. A French study found that women were more likely to accept an offer to dance with a man at a club, and to give their number to a stranger on the street, if he lightly touched their arm while asking. When questioned about why they said yes, the women who had been touched said they thought the man was more dominant, which might be expected, but they also rated him as more attractive physically.

In addition to proving that French and Italian scientists are exactly as slimy as we'd expect, the studies suggest that standing to someone's right and repeatedly touching that person's arm does the trick. Of course, if you're the sort of person who whispers into a potential partner's ears and lightly touches the person on the arm, you're probably already pretty confident. For the rest of us, just try to keep in mind that a light touch seems to do the trick.